I think every coal they process is high vol. (30+). Almost all bit coal in ohio is, although different high vol coals do burn differently; some will gas more quickly, and produce more soot even w/ the same % of volatiles.
If you're looking to burn it in a hand-fired stove, the things to be most concerned with is size, coke button, and ash %.
Their #6 was around 10% ash, high vol, but speed of volatile release was about average - not spectacular in either direction. It did NOT coke badly (bear in mind this is a few years ago and the properties of their #6 are likely to have changed somewhat), and was available in large lumps. All told it burned pretty nicely. Hand-firing
any bit coal (esp. any high vol) will produce some smoke from the stack; the proper size coal, the proper appliance, and the proper firing technique will reduce it, but don't expect it to disappear.
Looking to switch to the good stuff ??